SMOOTH1 and SMOOTH2 each smooth a data sequence by convolving it with a filter that's well-suited to smoothing. The output and its first two derivatives will be smooth.
Each smoother is controlled by a user-supplied response time, in units of samples, which produces about the same agility as a moving average of that many samples. The output is much smoother though, due to far greater high-frequency attenuation.
SMOOTH1's impulse response is nonnegative, like a Gaussian but compact. SMOOTH2's impulse response has just enough of a negative outer lobe to flatten the low-frequency response and give perfect response to a quadratic input component. Which to prefer is hard to say, or may depend on the application.
Both smoothers provide strong high-frequency attenuation. Their frequency response "sidelobes" start below -60 dB and fall 18 dB per octave, making even the double-differentiated output smooth.
See also LSSMOOTH (ID:49789), IRLSSMOOTH (ID:49788)
引用格式
Jim (2024). Two Simple Smoothers (https://www.mathworks.com/matlabcentral/fileexchange/50342-two-simple-smoothers), MATLAB Central File Exchange. 检索来源 .
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